QuickPlay is a graphical frontend for multiple gaming system emulators (MAME, MESS). It can manage and find ROMs, download new game engines, understands ZIP and other archive formats, virtual folder, drag and drop support, or backups.
Attract-Mode is a GUI for game system emulators such as MAME, MESS and Nestopia. It abstracts the operating system, can be navigated per joystick, gamepad and spin dial. It's thus suitable for cabinet installations, works on Linux, OS X and Windows; is scriptable per Squirrel, provides a configurable menu, screensaver and background music, has a convenient history and play or score statistics.